Autonomic Nervous System Lecture 4

What is the primary action of the α1 adrenergic receptors in the sympathetic nervous system?

Which structure is NOT under the influence of β1 adrenergic receptors?

What is the origin of the parasympathetic nervous system?

Which cranial nerve is associated with pupil constriction?

What effect do β2 adrenergic receptors have on the bronchi?

What is the primary function of the facial nerve in the parasympathetic nervous system?

Which of the following structures primarily receives innervation from the glossopharyngeal nerve?

What is the general rule governing the actions of the sympathetic nervous system?

Autonomic Nervous System Lecture

Date: 19/10/2024
Lecturer: Mohamed Talal
Topic: Autonomic Nervous System (Lecture 4)

Sympathetic Nervous System

General Rule: Causes vasoconstriction in all blood vessels except those supplying the heart and skeletal muscles.
Receptors: Adrenergic receptors categorized as alpha (α) and beta (β). Subtypes include α1, α2, β1, β2, and β3.

α Receptors

α1: Causes contraction
- Site(s): Eye (dilator pupillae muscle), arterioles, GIT sphincters, internal urethral/anal sphincters, GIT wall.
α2: Causes relaxation
- Site(s): GIT wall

β Receptors

β1: Stimulation
- Site(s): Heart
β2: Relaxation
- Site(s): Wall of bronchi, rectum, urinary bladder
β3:
- Site(s): Adipose tissue (lipolysis and thermogenesis)

Parasympathetic Nervous System

Origin: Cranio-sacral
Cranial Outflow:
- Oculomotor Nerve: Pupil constriction, targets constrictor pupillae muscle
- Facial Nerve: Increases secretions of sublingual and submandibular glands
- Glossopharyngeal Nerve: Increases secretions of parotid gland
Sacral Outflow: Pelvic branches of S2-S4

Explore the complexities of the Autonomic Nervous System in Lecture 4. This session covers the sympathetic and parasympathetic divisions, including receptor types and their functions. Understand the roles of adrenergic receptors and the physiological impacts on various body systems.